diff --git a/web_server.py b/web_server.py
index 6972b18..255bbf4 100644
--- a/web_server.py
+++ b/web_server.py
@@ -2167,7 +2167,8 @@ def get_conversation_messages(conversation_id, terminal: WebTerminal, workspace:
 def compress_conversation(conversation_id, terminal: WebTerminal, workspace: UserWorkspace, username: str):
     """压缩指定对话的大体积消息，生成压缩版新对话"""
     try:
-        result = terminal.context_manager.compress_conversation(conversation_id)
+        normalized_id = conversation_id if conversation_id.startswith('conv_') else f"conv_{conversation_id}"
+        result = terminal.context_manager.compress_conversation(normalized_id)
 
         if not result.get("success"):
             status_code = 404 if "不存在" in result.get("error", "") else 400